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What This Guide Helps With
Addresses failed or incomplete pre-use checks caused by circuit setup, accessories, gas supply, external connections, configuration, or equipment faults.
Step-by-Step Troubleshooting
1. Protect the Patient and Maintain Ventilation
Do not troubleshoot a ventilator that cannot complete required checks while a patient depends on it. If the device is in clinical use and reliability is uncertain, transfer ventilation to another verified ventilator or appropriate backup method.
Remove the Evita V600 from clinical use until the cause is identified and required verification is completed.
Expected outcome: Patient ventilation remains uninterrupted and troubleshooting is performed on an isolated device.
2. Confirm the Exact Failed Check
Repeat the reported condition only when safe and note which portion of the system or pre-use check does not complete. Record any displayed message exactly as shown.
Determine whether the failure occurs consistently or only with a particular circuit, accessory, or configuration.
Expected outcome: The specific failed stage or condition is identified. If the check now completes normally and the device passes required verification, troubleshooting can stop.
3. Inspect the Breathing Circuit Setup
Verify that the breathing circuit is completely assembled, connected to the correct inspiratory and expiratory paths, and free of obvious disconnections, kinks, cracks, loose fittings, or incorrect components.
Check water traps, humidification components, filters, and other externally installed accessories for incorrect positioning or obstruction.
Expected outcome: The breathing system is complete, correctly assembled, and unobstructed. If correcting the circuit allows the system check to pass, troubleshooting can stop after final verification.
4. Verify the Expiratory Valve and Flow-Sensing Components
Inspect externally accessible expiratory valve and flow-sensing components for correct installation, secure seating, contamination, moisture, physical damage, or incomplete connection.
Do not disassemble components beyond normal approved removal and installation procedures.
Expected outcome: All externally removable respiratory components are correctly installed and recognized. If reseating or replacing an approved component restores the check, proceed to final verification.
5. Verify Air and Oxygen Supply
Confirm that required gas supplies are connected and available. Inspect hoses and fittings for loose connections, damage, pinching, or incorrect attachment.
If facility gas supply is questionable, compare operation using another verified source when permitted by facility procedure.
Expected outcome: Required gas sources are available and stable. If restoring an external gas connection clears the failure, troubleshooting can stop after verification.
6. Check Electrical Power and Basic Startup
Confirm the ventilator is connected to a known-good AC source and that the power cord and accessible connectors are secure and undamaged.
Observe startup for abnormal resets, incomplete booting, unexpected power transitions, or other indications that could interfere with the check.
Expected outcome: The ventilator powers normally and remains stable throughout the check.
7. Verify Required Accessories and Configuration
Confirm that installed breathing-system accessories match the intended clinical configuration and that no recently changed component has introduced an incompatibility or setup problem.
Compare with another correctly configured Evita V600 when available rather than making unsupported configuration changes.
Expected outcome: The physical setup and selected configuration agree. If correcting an external configuration mismatch restores the check, troubleshooting can stop after verification.
8. Substitute Known-Good External Components
When appropriate, substitute known-good approved components one at a time, such as the breathing circuit, flow-sensing component, expiratory valve assembly, gas hose, or other removable accessory associated with the failed check.
Changing one item at a time helps identify the cause without masking multiple problems.
Expected outcome: The system check completes with the known-good component. Replace the defective external component and continue to final verification.
9. Perform Final Functional Verification
Repeat the complete required system or pre-use check after corrections. Verify normal ventilation using appropriate test equipment or a test lung and confirm that alarms and monitored values respond appropriately.
Expected outcome: The ventilator completes required checks and demonstrates stable, expected operation. Troubleshooting can stop and the device may be returned to service according to facility policy.
10. Escalate an Unresolved Failure
If the check continues to fail after external setup, gas supply, connections, and removable components have been verified, stop troubleshooting at the external level.
Expected outcome: The unresolved ventilator is prevented from returning to clinical use pending qualified service evaluation.
If the Problem Persists
Common external causes have been ruled out. Remaining possibilities may involve internal pneumatic, sensing, electronic, software, calibration, or configuration-related faults.
The ventilator should be:
- Removed from service
- Labeled Out of Service
- Sent for repair or bench evaluation
- Evaluated using appropriate manufacturer documentation and approved test equipment
- Repaired or configured only by qualified personnel
Following repair, complete all required operational, alarm, ventilation-performance, and applicable safety testing before return to service. Knowing when to stop external troubleshooting is proper troubleshooting.
Clinical Use Tip
Never place an Evita V600 into patient service when a required pre-use or system check remains incomplete or failed.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Respiratory Therapy reported that the Evita V600 would not complete the pre-use system check."
Cause
What was observed during troubleshooting.
Example:
"Clinical Engineering found the expiratory breathing-system component was not fully seated, preventing successful completion of the check."
Resolution
What action was taken.
Example:
"The component was correctly reseated, the system check was repeated successfully, and ventilator operation was verified with a test lung before return to service."
Helpful Details to Include (If Known)
- Exact failed check or displayed message
- Whether the failure repeats
- Breathing circuit configuration
- Expiratory valve condition and seating
- Flow-sensing component condition
- Gas sources connected and tested
- AC power status
- Accessories installed
- Known-good components substituted
- System check result after correction
- Final functional verification result
- Final device status
Final Thought
A failed ventilator system check should be approached by protecting the patient, verifying the complete external setup, ruling out gas, circuit, accessory, and connection problems, and escalating when required checks cannot be successfully completed. Clear CCR documentation should show both the identified cause and the verification performed before return to service.
That is successful troubleshooting.